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The temperature-dependent electrical conductances of sets of ultrathin amorphous Pd films prepared by successive deposition in situ at low temperatures have been found to scale over a range of conductances encompassing both the strongly and weakly localized regimes. This scaling, as well as the variation of the scaling parameter with the Boltzmann conductance, suggests a unified picture of the insulator-to-metal transition in two dimensions.
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Liu et al. (1992) studied this question.
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